heres a link to the layout of a td42 injectorso i would think a td27 injector is just a bit smaller

again i think it would be unwise to start playing with the pressures without a pressure tester

Damn did i say i would change the injector nozzles my self? Allready got the layout on the injectors but thanks anyway according to my Factory workshop manual the burst pressure on the injectors should be from 103-112.8Bar so how much would be wise to go up from that?

I googled it as well . the only result I found was "from memory they are .014.........."

It is quite likely correct, but I'm not at all keen on trying out something from someone's "memory" .Thanks all the same for the consideration. I am much more at ease with definite spec from genuine service literature. Hence my post[s] inquiring here. If anyone happens to have a service manual for a Nissan TD27t, I would be delighted to hear from them.

As for cracking pressure,I don't believe exceeding any factory spec comes without a cost. Especially with regards to altering injection timing and it's effects on volumetric efficiency. Nissan spends millions of dollars on R&D in order find the best comprimise between longevity and performance.

Even with 18 years experience as a factory trained diesel mechanic, I'm not comfortable second guessing the engineers at Nissan and possibly shortening the service life of my machinery.